Re: [PATCH 00/26] IPVS: Add first IPv6 support to IPVS.

To: Julius Volz <juliusv@xxxxxxxxxx>
Subject: Re: [PATCH 00/26] IPVS: Add first IPv6 support to IPVS.
Cc: Patrick McHardy <kaber@xxxxxxxxx>, lvs-devel@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx
From: Vince Busam <vbusam@xxxxxxxxxx>
Date: Wed, 11 Jun 2008 13:55:25 -0700
Julius Volz wrote:
Ah, but the set/get-sockopt calls also pass a size argument, which is
the size of the passed structs. If the kernel and userspace struct
sizes don't match, it is treated as an error. Is this in case
different compilers pad the structs differently, even if the IPVS
version stays the same?

So we could disable the size checks of the passed structs, or key on it to determine if the older ABI was used, keeping a list of the structs that had different sizes around, but that sounds like a gross hack which would get worse if any other fields are added. It would also mean new userspace binaries with the new fields wouldn't work with older kernels, is that a problem? Is this better than the alternatives of breaking the ABI, or duplicating code into a separate ABI?

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